It does not have to do with the book or any other medium. It comes from the learner. You are right about the problems mentioned. 1. Stuff does not have longevi

It does not have to do with the book or any other medium. It comes from the learner. You are right about the problems mentioned. 1. Stuff does not have longevity. This is because most of the new tools are outside curriculum. This does not encourage students to learn something extra. 2. Proprietary. Books providing add ons have a different goal. They want to sell their books. So the addons or just that. Add ons. They are not complete. These were some of the thoughts which encouraged us to build [1]. Keep it curriculum focused so kids don't learn anything extra. No books to sell :) [1] https://books.innings2.com/ https://books.innings2.com/